The problem with inventions is that big companies with deep pockets will steal your idea, if it looks like a money maker, whether or not you have a patent, and it's up to you to police it, discover the theft and sue them, which can be costly for an individual. Generally they'll offer to buy your invention from you, and if you don't agree to sell, they'll bankrupt you with a lifetime of legal wrangling. Sorry to sound so downbeat, but that's just the way it often goes.